Scientific Program HMC2016 4th Historic Mortars Conference - PDF document

HMC2016 4th Historic Mortars Conference Scientific Program

HMC2016 4th Historic Mortars Conference Organizing Committee Papayianni Ioanna Professor AUTH Stefanidou Maria Associate Professor AUTH Palyvou Clairy Emeritus Professor AUTH Pachta Vasiliki Dr Architect, Conservator AUTH Scientific Committee Binda Luigia Politecnico di Milano, Italy Biçer!"im#ir Beril The Getty Conservation Institute, USA Bokan Bosiljkov Violeta University of Ljubljana, Slovenia Groot Caspar Delft University of Technology, Netherlands Hughes John University of the West of Scotland, Scotland Jornet Alberto University of Applied Sciences and Arts of Switzerland, Switzerland Lindqvist Jan Erik Cement & Concrete Research Institute, Sweden Maurenbrecher Paul National Research Council of Canada, Canada Middendorf Bernhard Technische Universität Dortmund, Germany Papayianni Ioanna Aristotle University of Thessaloniki, Greece Pachta Vasiliki Aristotle University of Thessaloniki, Greece Piqué Francesca University of Applied Sciences and Arts of Switzerland, Switzerland Stefanidou Maria Aristotle University of Thessaloniki, Greece Tedeschi Christina Politecnico di Milano, Italy Toniolo Lucia Politecnico di Milano, Italy Toumbakari Eleni Hellenic Ministry of Culture, Greece Valek Jan Academy of Sciences, Czech Republic Van Hees Rob Delft University of Technology, TNO, Netherlands Veiga Maria!Rosario National Laboratory for Civil Engineering, Portugal Velosa Ana University of Aveiro, Portugal

HMC2016 4th Historic Mortars Conference Coffee break 11:00 ! 11:30 11:30!13:15 Session X / Repair mortars for Session XI / Repair mortars for historic masonry historic masonry Hall A Hall B Chair : Rob Van Hees, Ana Velosa Chair : Suzana Slizkova, Ana Radivojevic 11:30 5 11:45 Wood ash as an Additive: a Study Restorative Waste!based Lime of its Influence on the Physical Mortars with Inclusion of Spent Properties of Lime Mortars , Lucie Cooking Oils, Parsa Pahlavan, Fusade, Heather Viles Stefania Manzi, Maria Chiara Bignozzi 11:45 5 12:00 The use of a lignosulfonate Experimental study of bond superplasticizer in repair air lime! strength developed between metakaolin mortars , M. Pérez5 traditional type bricks and lime! Nicolás, A. Duran, R. Sirera, I. based repair mortars, Dimitris Navarro5Blasco, J.M. Fernández, J.I. Papadimitriou, Ioanna Papayianni Alvarez 12:00 5 12:15 Behaviour of air lime!metakaolin Mechanical and durability mortars modified with properties of lightweight mortars polynaphthalene sulfonate as for the backing of ancient mosaics , superplasticizer , A. Duran, R. Sabina Kramar, Martina Lesar5Kikelj Sirera, M. Pérez5Nicolás, I. Navarro5 Blasco, J.M. Fernández, J.I. Alvarez 12:15 5 12:30 Preliminary study on the use of Fiber! reinforced lime mortars , ammonium phosphate for the Maria Stefanidou, Michael conservation of marble!imitating Papachristoforou, Fotini Kesikidou gypsum!stuccoes , Enrico Sassoni, Gabriela Graziani, George W. Scherer, Elisa Franzoni 12:30 5 12:45 Pompeian stucco plaster without Comparative study for water aggregates: a case study of protection of traditional packed reconstruction , Christian Kaiser, floor mortars, Katia Matziaris, Maria Katrin Wilhelm, Ronja Emmerich Stefanidou, George Karagiannis 12:45 5 13:15 Discussion Discussion

Behaviour of air lime-metakaolin mortars modified with polynaphthalene sulfonate as superplasticizer A. Duran 1 , R. Sirera 1 , M. Pérez-Nicolás 1 , I. Navarro-Blasco 1 , J.M. Fernández 1 , J.I. Alvarez 1 1 MIMED Research Group, Department of Chemistry and Soil Science, School of Sciences, University of Navarra, Spain, jalvarez@unav.es, mimed@unav.es A new range of repair lime mortars were obtained by using as superplasticizer a polynaphthalene sulfonate-based polymer (PNS). In some mortars the simultaneous addition of metakaolin as a Supplementary Cementitious Material was also tested. In the fresh stage, PNS showed a clear dosage-response pattern: the higher the PNS dosage, the larger the slump values of the fresh pastes. PNS was helpful in most of cases to reduce the setting time in comparison with SP-free pastes: this fact could be useful to shorten the extended setting times that is a well-known problem ascribed to the use of air lime mortars in repairing works of the Built Heritage. Adsorption isotherms showed that PNS exhibited a high affinity for air lime particles with 52.08 mg·g -1 as maximum sorption capacity in pure air lime media. Mathematical treatment of experimental data showed an optimal adjustment to a Freundlich model, in which interactions arising from multilayer adsorption are taken into account. The experimental results suggested a great interaction of PNS with air lime media (pure air lime or air lime with pozzolanic additives). Zeta potential curves of air lime systems titrated with PNS showed a larger zeta potential reduction, giving rise to a charge reversal, as a consequence of the high anionic charge density of this polymer (2.44 meq of anionic charge·g -1 ). A flat adsorption was proposed as the attachment model of this admixture, owing to its higher anionic charge density and to its linear shape. The attached molecules could be surrounded by the growing carbonation/hydration products, yielding inactive organo-mineral phases. The electrostatic repulsion was then the main action mechanism to explain the PNS function. In the hardened state, the combination of PNS and MK resulted sometimes in moderate mechanical strength increases, although a certain interaction with the C-S-H formation was also seen.

Introduction Generally, plasticizers or so called superplasticizers (depending on their action Behaviour of air lime-metakaolin capability) are organic molecules added in low percentages (usually below mortars modified with polynaphthalene 0.5%) to fresh binding mixtures aiming to reduce the mixing water and improving the fluidity . sulfonate as superplasticizer A. Duran, R. Sirera, M. Pérez-Nicolás, I. Navarro-Blasco, J.M. Fernández, J.I. For repair air lime mortars and grouts, these superplasticizers appear as Alvarez potentially applicable admixtures with the purpose of MIMED Research Group  keeping a good flowability of the plastic mixtures. Department of Chemistry, School of Sciences, University of Navarra, Spain.  enhancing the mechanical resistance as a consequence of a lower mimed@unav.es porosity. Introduction Conclusions  The incorporation of PNS increased the slump of the MK-added air lime In addition, the simultaneous use of a pozzolanic additive, such as the well- known metakaolin (MK), could yield mortars and grouts with suitable  PNS showed a poor dispersion maintaining ability  consistency ,  The flat adsorption of PNS and ulterior formation of organo-mineral  setting times and phases seems to be responsible for this behaviour.  final mechanical strengths.  Adsorption isotherms revealed a high consumption of this admixture in MK-air lime samples. From the point of view of the scientists devoted to Built Heritage , the  A positive effect of the combination of PNS and MK was found in terms investigation on these issues broadens the knowledge about materials that could be applied for restoration processes . of mechanical strengths as well as durability (freezing-thawing and sulfate attack). 1